Question

Since the 1980s, it ______ possible to listen to British and American English at the flick of a switch.

A. is	B. has been
C. had been	D. was

Answer 1

B

考查时态：时间是since the 1980s，和现在完成时连用，句意：自从20世纪80年代开始，在轻弹开关我们一直可以听到英式英语和美式英语。选B。